OFDMA系统小区间干扰调度协调算法

Inter-cell interference coordination schedule algorithm for OFDMA systems

为了防止小区间干扰严重降低频率复用因子为1的OFDMA系统性能,提出基于正交补空间的分布式干扰协调算法和比例公平干扰协调算法.分布式干扰协调算法根据用户反馈的信道信息,以用户信道右奇异值向量发送波束成形,以干扰信道左奇异值向量张成干扰空间,按照最大化系统容量准则调度干扰空间的正交补空间中的用户,在躲避小区间干扰的同时不增加对邻小区的干扰.比例公平干扰协调算法在调度正交补空间中的用户的同时考虑用户公平性.仿真结果表明,分布式干扰协调算法提高了系统容量.与分布式干扰协调算法相比,比例公平干扰协调算法在系统容量损失6%的情况下,边缘用户容量提升约50%.

For avoiding severe performance degradation led by the inter-cell interference （ICI） in OFDMA systems with the frequency factor 1, the distributed coordination algorithm （CO-OCS） and coordination proportional fairness algorithm （PF-OCS） based on orthogonal complement space are proposed. The CO-OCS algorithm chooses the right regular vector of the user channel as the bearnforming vector and the row span as an interference space from the left regular vectors of the interference channels. A suitable user lying in the orthogonal complement space of the interference space is scheduled to be free of suffering inter-cell interference and aggravating the interference in neighboring ceils. The PF-OCS algorithm takes the fairness into account in scheduling. The CO-OCS algorithm gives a higher frequency efficiency and expands the system capacity. The PF-OCS algorithm can achieve almost 50% the cell edge performance gain at the cost of 6% cell throughput degradation than the CO-OCS algorithm.